JLo and Ex Husband, Mac Anthony reunite

Jennifer Lopez and Marc Anthony reunited in New York City on Aug. 27 — but it was for one night only.

Just days after splitting from dancer-choreographer Casper Smart, 29, J.Lo surprised her ex-husband’s Radio City Music Hall audience when she joined Marc on stage for a duet during his “Private Collection” concert.

She not only sang “No Me Ames” with Marc, 47, in Spanish, but embraced him when the song came to an end.

“Always fun sharing the stage w this one… @marcanthony #NoMeAmes#radiocitymusichall #familia,” Jennifer captioned a photo of herself singing with Marc on Instagram later that night.

J.Lo, 47, looked incredible in a sheer, skin-baring black gown with a plunging neckline and a high slit as she emerged from a set of stairs and joined Marc on stage amid deafening cheers in a moment captured on video by fans.

Afterward, Marc shared a photo of himself, J.Lo and their 8-year-old twins Max and Emme posing backstage alongside his new wife, Shannon de Lima, 28, as well as with his side of the family.

“#MiGente, thank you to the fans and @jlo for a wonderful concert. #AllAboutFamily backstage last night at@radiocitymusichall #ThePrivateCollection #Tour2016,” Marc captioned the photos.

Jennifer’s appearance comes two weeks after Marc showed up in Las Vegas for her “All I Have” show at the Planet Hollywood Resort & Casino.

J.Lo gave her ex a shout-out during her Vegas performance show, telling the crowd, “You’re an international legend and icon, but you’re also my baby daddy” as Marc — who later posed backstage with Jennifer and her then-boyfriend Casper shortly before the split — stood up and took a bow.

Marc and Jennifer announced their own breakup in 2011 after seven years of marriage.

Their divorce was finalized in 2014, the same year Marc married Shannon, a Venezuelan model and beauty pageant veteran.